Multi-mode blind equalization method and system for multi-system quadrature amplitude-modulated signal under non-Gaussian noise

A non-Gaussian noise and multi-mode blind equalization technology, which is applied in multi-carrier systems, baseband system components, and shaping networks in transmitters/receivers, can solve problems such as high computational complexity and large computational load, and achieve The effect of reducing the bit error rate, effectively utilizing bandwidth, and avoiding steady-state misalignment

Pending Publication Date: 2022-07-29
XIDIAN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they have the inherent disadvantage of relatively large offsets when recovering multilevel QAM signals (not digital-to-analog signals): (Szczecinski, L.L., and Gei, A. Blind decision feedback equalisers, how to avoid degenerated solutions. Signal Process.82 (11)(2002)1675–1693.), (JLi,D Feng,B Li. ARobustAdaptive Weighted Constant Modulus Algorithm for Blind Equalization ofWireless Communications Systems under Impulsive Noise Environment.AEU-IntJElectron Commun.83(2018)150-155. )
[0006] (1) The existing blind equalization method has high computational complexity and a large amount of calculation
[0007] (2) Most blind equalization methods cannot be well applied to non-Gaussian noise environments

Method used

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  • Multi-mode blind equalization method and system for multi-system quadrature amplitude-modulated signal under non-Gaussian noise
  • Multi-mode blind equalization method and system for multi-system quadrature amplitude-modulated signal under non-Gaussian noise
  • Multi-mode blind equalization method and system for multi-system quadrature amplitude-modulated signal under non-Gaussian noise

Examples

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Embodiment 1

[0122] Example 1: Battlefield Application

[0123] When deciphering and intercepting enemy signals on the battlefield, some information of flying objects such as artillery shells is often intercepted. If these signals are also used to train the equalizer, some large errors may be caused. The present invention sets a threshold for the intercepted signal, and the signal with too large difference will be filtered out without affecting the equalizer. Therefore, it can be well applied to the battlefield environment, which is of great significance in the application embodiment.

Embodiment 2

[0124] Example 2: Communication interruption after earthquake

[0125] After an earthquake, the receiver is often unable to track, resulting in a loss of communication, which can also occur in the following aftershocks. When the communication is interrupted for a short time, in order to re-establish the communication, the training sequence must be sent to initialize the receiver before each new communication starts, which requires the system to increase the feedback channel to transmit the request training signal, which makes the system complicated ,hard to accomplish. The invention does not need to use the training sequence to initialize the receiver continuously, and only uses the prior information of the received sequence itself to equalize the channel characteristics, so that the output sequence of the equalizer is as close to the transmission sequence as possible, and can be well applied to this kind of Happening.

[0126] 3. Evidence of the relevant effects of the embo...

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Abstract

The invention belongs to the technical field of blind equalization in wireless communication, and discloses a multi-system quadrature amplitude modulation signal multi-mode blind equalization method and system under non-Gaussian noise, and the method comprises the steps: defining a sample set, and converting a multi-stage signal sample into a single-stage signal sample; defining a decision threshold, judging whether the currently received instantaneous signal belongs to the sample set, and if not, filtering the sample; if so, carrying out iterative operation; and carrying out differential calculation on the corrected cost function to obtain a gradient, calculating an iterative formula of the equalizer according to a gradient descent method, substituting the filtered sample into calculation, iteratively updating the equalizer and minimizing the cost function. The invention develops the multi-mode blind equalization method for the multi-system quadrature amplitude-modulated signal under the non-Gaussian noise, which can avoid steady-state imbalance, reduce intersymbol interference and interchannel interference and reduce calculation complexity. In addition, large-error outliers are discarded when samples are filtered, so that the method can be well applied to a non-Gaussian noise environment.

Description

technical field [0001] The invention belongs to the technical field of blind equalization in wireless communication, and in particular relates to a multimode blind equalization method and system for a multi-ary quadrature amplitude modulation signal under non-Gaussian noise. Background technique [0002] At present, the blind equalization technology is one of the important technologies to improve the reliability of the communication system, which is used to solve the problem of inter-symbol interference caused by the multipath effect of the channel. In modern communication systems, inter-symbol interference (ISI) and inter-channel interference (ICI) caused by the distortion and distortion of limited-bandwidth communication channels are important factors affecting communication quality. The accumulation of inter-symbol interference and inter-channel interference will lead to the generation of bit errors, resulting in the degradation of communication quality. Blind equalizati...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/38
CPCH04L25/03089H04L27/38H04L2025/03611H04L2025/03675
Inventor 李进鲍欣格刘明骞张俊林
Owner XIDIAN UNIV
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